<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
    <h2>{{fullName}}</h2>
</div>

<script src="../js/vue.js"></script>
<script>
    const  app = new Vue({
      el:'#app',
      data:{
        message: '卢本伟牛逼！',
        firstName: '莫',
        lastName: '偿命'
      },
        // 计算属性
      computed: {
          fullName: function f() {
            return this.firstName+ ' ' + this.lastName
    }
      }
    })
</script>
</body>
</html>